
*{margin: auto;padding: auto }
        .vav{
            width: 1101px;height: 64px;
            text-align: center;
            margin-top: 20px;
        }
        .logo{
            width: 320px;
            float: left;
        }
        .logo img{
            width: 218px;
        }
        .directory{
            width:373px;
            float: right; 
            margin-top: 17px;
        }
        .directory a{
            color:#898989;
            text-decoration: none;
            font-size: 14px;
            margin-bottom: 10px;
            margin-right: 10px;
        }
        .directory a:hover{
            color: #2DAE36;
            border-bottom: 3px solid #2DAE36 ;
            padding-bottom: 20px ;
        }
       /* a:visited{   //用户访问过的连接
            color: #2DAE36;
            border-bottom: 3px solid #2DAE36;
        }*/
        /*  a:active{ //在点击的时候连接到
            color: #2DAE36;
            border-bottom: 3px solid #2DAE36;
        }*/